121221200998 has 4 divisors (see below), whose sum is σ = 181831801500. Its totient is φ = 60610600498.

The previous prime is 121221200987. The next prime is 121221201001. The reversal of 121221200998 is 899002122121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30305300248 + ... + 30305300251.

It is an arithmetic number, because the mean of its divisors is an integer number (45457950375).

Almost surely, 2^121221200998 is an apocalyptic number.

121221200998 is a deficient number, since it is larger than the sum of its proper divisors (60610600502).

121221200998 is an equidigital number, since it uses as much as digits as its factorization.

121221200998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60610600501.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 121221200998 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, nine hundred ninety-eight".